Merge branch 'ISAICP-8709' into 'develop'

ISAICP-8709: PHP error from joinup_notification (JoinupMessageDelivery::sendMessage)

See merge request digit/digit-joinup-dev!1345

tests/features/solution/solution.notifications.feature

@@ -20,6 +20,7 @@ Feature: Solution notifications
     And users:
       | Username     | Roles     | First name | Family name | E-mail                   |
       | Pat Harper   | moderator | Pat        | Harper      | pat.harper@example.com   |
+      | Jack Harper  | moderator | Jack       | Harper      | jack.harper@example.com  |
       | Ramiro Myers |           | Ramiro     | Myers       | ramiro.myers@example.com |
       | Edith Poole  |           | Edith      | Poole       | edith.poole@example.com  |
     And the following solutions:
@@ -76,7 +77,7 @@ Feature: Solution notifications
       | recipient | Ramiro Myers                                                                                                                                                              |
       | subject   | Joinup: You are requested to update your solution                                                                                                                         |
       | body      | the moderator has requested you to modify the interoperability solution - Solution notification to request changes following the following advises: Can you change this?. |
-      | bcc       | pat.harper@example.com                                                                                                                                                    |
+      | bcc       | pat.harper@example.com,jack.harper@example.com                                                                                                                            |
     And the email sent to "Ramiro Myers" with subject "Joinup: You are requested to update your solution" contains the following lines of text:
       | the moderator has requested you to modify the interoperability solution - Solution notification to request changes following the following advises: Can you change this?. |
       | If you think this action is not clear or not due, please contact Joinup Support at                                                                                        |

web/modules/custom/joinup_notification/joinup_notification.module

@@ -231,7 +231,7 @@ function joinup_notification_mail_alter(array &$message): void {
       $bcc = array_map(function ($value) {
         return $value['value'];
       }, $message_entity->get('field_message_bcc')->getValue());
-      $message['headers']['Bcc'] = implode(';', $bcc);
+      $message['headers']['Bcc'] = implode(',', $bcc);
     }
   }